You aren't transmitting your genome over the Internet or anything like that because the bits of DNA that you are thinking about are never sequenced. Your DNA gets sent to a university medical facility and only the Y/mtDNA are sequenced there. Those bits of sequenced information are basically useless for any of the scary situations you're imagining. The medical lab turning over your actual DNA would be akin to your doctor turning over your DNA to a government agency. Are you going to stop seeing doctors too?